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Related Concept Videos

Upstream Processing01:27

Upstream Processing

Upstream processing represents a critical phase in biomanufacturing, wherein biological systems such as microorganisms, mammalian cells, or insect cells are cultivated to produce therapeutic proteins, vaccines, enzymes, or other biologically derived products. This phase encompasses all steps from the selection and genetic manipulation of the production organism to the cultivation of cells in bioreactors under tightly controlled environmental conditions.Host Selection and Genetic OptimizationThe...
Bioreactor Design and Operational System01:29

Bioreactor Design and Operational System

Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
Designing Growth Media for Bioreactors01:30

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Growth media provide essential nutrients that support cell growth and metabolism, thereby enhancing the yield of valuable products such as enzymes, antibiotics, and biomass. Designing an effective growth medium involves balancing all components to prevent nutrient limitations or toxic excesses, both of which can impair growth and reduce product yields.Composition of a Typical Growth MediumA typical growth medium contains carbon and nitrogen sources, salts, vitamins, trace elements, and...
Production of Antibiotics01:27

Production of Antibiotics

Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
Production of Pharmaceuticals01:30

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Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...
Bioreactor Controls-III01:22

Bioreactor Controls-III

Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...

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Updated: Jun 22, 2026

Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology
06:24

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Published on: December 15, 2017

Modular model-based design for heterologous bioproduction in bacteria.

Thomas E Landrain1, Javier Carrera, Boris Kirov

  • 1Synth-Bio group. Epigenomics Project, Université d'Evry Val d'Essonne-Genopole-CNRS UPS3201, 91034 Evry, France.

Current Opinion in Biotechnology
|June 30, 2009
PubMed
Summary

This study reviews mathematical models for optimizing bioenergy and bioproduction in bacteria. It highlights using characterized genetic parts to enhance synthetic biology designs for maximal yield and minimal toxicity.

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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Microbial biotechnology

Background:

  • Heterologous gene expression in bacteria is crucial for bioenergy and bioproduction.
  • Synthetic biology aims to design and construct novel biological functions, requiring predictable genetic modules.
  • Mathematical models are essential for understanding and optimizing complex genetic circuits.

Purpose of the Study:

  • To review the current status of heterologous gene expression systems in bacteria for bioenergy and bioproduction.
  • To emphasize the role of model-based approaches in synthetic biology for designing metabolic circuits.
  • To explore the optimization of bioproduction pathways for maximal yield and minimal chassis toxicity.

Main Methods:

  • Model-based approach for analyzing genetic modules.
  • Independent characterization of genetic parts (promoters, RBS, sRNAs).
  • Combinatorial design of metabolic circuits.

Main Results:

  • Mathematical models facilitate context-independent characterization of genetic modules.
  • Characterized genetic parts enable fine-tuning of gene expression.
  • Optimization strategies can achieve maximal bioproduction while ensuring chassis non-toxicity.
  • A comprehensive list of enzymes for bioproduction is presented.

Conclusions:

  • Model-based approaches are vital for advancing synthetic biology in microbial systems.
  • Precise control over genetic elements enhances the efficiency of bioenergy and bioproduction.
  • The presented framework supports the rational design of engineered microbial cell factories.